Concrete dump bucket



Sept. 1, 1964 R. s. COZADD ETAL CONCRETE DUMP BUCKET 2 Sheets-Sheet 1 Filed May 13, 1963 INVENTOR5 ew/wo/va 5. 622400 By fi/a /meol Mug-e 0W Arne/145v:

P 1, 1954 R. B. COZADD ETAL 3,146,924

CONCRETE DUMP BUCKET Filed May 13, 1963 2 Sheets-Sheet g I INVENTORS United States PatentO 3,146,924 CONCRETE DUMP BUCKET Raymond B. Cozadd, West Covina, and Richard A.

Miller, Chino, Calif assignors to Miller Swivel Products, Inc., Pomona, Califl, a corporation of California Filed May 13, 1963, Ser. No. 279,951 9 Claims. (Cl. 222-503) This invention relates in general to portable buckets for transporting and pouring of batches of concrete into construction forms and the like containers, and more particularly to such pouring buckets of the bottom dump gate type.

It has heretofore been well known to construct such portable pouring buckets with various kinds of mechanically or manually operated dump valves or gates in the bottoms thereof, controllable for release of concrete slurry or the like cementitious material from the bucket. Such dump gates have presented numerous mechanical and operational difliculties, among which has been the frequent jamming of the gate mechanism, either in its closed or opened position, as a result of the entrance into its mechanism of rocks and sand comprising the concrete aggregate, and also of frequent immobilisation of the valve after a period of standing, by reason of the solidification in critical portions of the gate mechanism of residual cement and sand slurry portions of the aggregate which the bucket has contained.

Other difiiculties which have been encountered in such gate mechanisms have been the excessive force and effort usually required for their operation resulting from the unbalanced weight and friction heretofore inherent in such mechanisms. Still other difliculties have been the lack of durability and continued ability to hold the concrete aggregate in the bucket without leakage, after a short period of use, resulting from excessive wear and from other inherent defects of construction. Another undesirable characteristic of some dump gates has been the lack of control of the form of the released stream of cementitious material, whereby portions of it tend to separate from the main stream and escape laterally through portions of the gate mechanism.

It is, accordingly, a principal object of this invention to provide a concrete pouring bucket having a bottom dump gate having a minimum of susceptibility to jamming by reason of the entrance into the mechanism thereof of portions of the concrete aggregate.

It is another object of this invention to provide a concrete dump gate which has improved durability and freedom from wear.

It is a still further object of this invention to provide a dump gate having improved control of the form of the stream of cementitious material discharged therethrough.

It is still another object of this invention to provide a concrete dump gate having improved means to exclude abrasive materials from the critical mechanical parts thereof.

It is a further object of this invention to provide a concrete dump gate having improved sealing ability and freedom from leakage.

It is a still further object of this invention to provide a concrete dump gate of such construction that the setting up of residual cementitious material on the inner exposed surface thereof will effect a minimum of interference with the operation of the valve.

It is a still further object of this invention to provide a concrete dump gate having improved freedom of operation and requiring a minimum of effort for its operation.

These and other objects, advantages, and features of novelty will be evident hereinafter.

In the drawings which illustrate a presently preferred embodiment and mode of operation of this invention and in which like reference characters designate the same or similar parts throughout the several views:

FIGURE 1 is a perspective view of a concrete pouring bucket embodying the present invention.

FIGURE 2 is a side view partly in elevation and partly in section of the pouring bucket of FIGURE 1.

FIGURE 3 is a plan or top view of the apparatus of FIGURES 1 and 2.

FIGURE 4 is an enlarged, fragmentary, elevational view of the dump gate portion of the apparatus as it appears in closed condition.

FIGURE 5 is an enlarged, fragmentary, elevational view of the dump gate portion of the apparatus, as it appears in opened condition.

FIGURE 6 is an enlarged, sectional view taken on line 66 of FIGURE 5.

FIGURE 7 is an enlarged, fragmentary, detailed sectional view taken on line 7-7 of FIGURE 5.

Referring to the drawings and first mainly to FIG- URES 1, 2, and 3, the whole pouring bucket assembly, which is shown generally at 19, comprises a metal container consisting of an open-topped, upper cylindrical portion 12 and a lower frusto-conical hopper portion 14, the upper edge of the hopper portion 14 being welded or otherwise suitably joined to the lower edge of the cylindrical portion 12, a metal supporting skirt structure, shown generally at 16, and a dump gate mechanism connected to the lower end opening of the frusto-conical hopper portion 14, as shown generally at 18.

The upper edge of the upper cylindrical portion 12 of the container terminates in a box-sectioned top ring member 20 formed of an annular channel sectioned member having the inner edges of the inwardly projecting legs thereof welded or otherwise suitably attached to the exterior, upper marginal portion of the before mentioned cylindrical portion 12. Extending diametrically across the upperopen end portion of the upper cylindrical portion 12 is a hoist bale 22, the diametrically opposite ends of which are attached through suitable gusset plates to diametrically opposite inner surfaces of the upper cylindrical container portion 12 and to the top ring member 20, as best shown at 24 and 26 in FIGURES 2 and 3. The hoist bale 22 comprises an A-shaped beam structure composed of a pair of spaced tubular members 28 and 30 connected together adjacent their apexes by web members 32 and 34. In operation, a hoist hook, as shown at 36 in FIGURE 1, engages the central apex of the upper tubular member 30 for hoisting, suspending, and converging the pouring bucket assembly.

The supporting skirt structure 16, which provides a means for supporting the pouring bucket in an upright position when sitting on the ground, comprises three equally, circumferentially spaced apart tapered skirt shaped supporting legs 38 which, in effect, form upwardly tapering, inwardly curving extensions of the upper cylindrical container portion 12. The upper ends of each of the legs 38 are welded or otherwise suitably attached, as shown at 39, to the circumferential juncture line between the lower edge of the upper cylindrical portion 12 and the upper edge of the frusto-conical hopper portion 14. The lower end edges of the legs 38 are welded or otherwise suitably connected to the upper outer edge of a base ring 41) formed of an annular shaped inwardly facing channel sectioned member. The generally vertical, marginal portions of each of the supporting legs 38 are bent inwardly at right angles to the adjacent surfaces thereof and the upper and lower end portions thereof, also welded to the external surface of the conical hopper portion 14 and the upper surface of the base ring 40, respectively, to lend added stiffness to the supporting assembly.

The lower reduced diameter end of the hopper portion 14 terminates in a circular spout or focal ring 46, upon and depending from which is supported the improved pouring bucket gate mechanism of this invention, indicated at 18 in FIGURE 1 and best shown in FIGURES 4, 5, and 7, and which is hereinafter more fully described.

The focal ring 46, which is welded or otherwise suitably attached, as shown at 15, to the lower edge of the circular bottom opening of the frustoconical hopper portion 14, is provided with a pair of diametrically oppositely positioned, downwardly extending bearing plates, one of which is shown at 48 in FIGURES and 7. Each bearing plate is provided with a pair of laterally extending bearing bolt holes, one of which is shown at 50 in FIGURE 7, and through each of which is positioned a pair of axially parallel, laterally extending bearing bolts or trunnions 52 and 54, one of such bolts, namely, bolt 52 being best shown in FIGURE 2. Each of the bolts 52 and 54 carries a tubular trunnion bushing, as shown at 56, the opposite ends of which are positioned in abutment with and nonrotationally clamped between the outside surface of the bearing plate 48 adjacent the bolt holes and nuts 58 and 59 threaded onto the outer end portion of the bolts.

Pivotally supported on the trunnion bushings 56 for closing and opening swinging movement, respectively, together and away from one another, are a pair of separate, oppositely positioned clamshell type gate jaws 60 and 62, said gate jaws each having a shape, which roughly approximates that of the surface of a spherical wedge and which, viewed from the exterior, is convexly U-shaped, terminating at opposite ends in a pair of parallel, diametrically opposite hinge arms 64 and 66 of reduced width. Through each of such hinge arms adjacent the outer ends thereof is formed a bearing bore, one of which is shown at 68 in FIGURE 7, which pivotally ride on the before mentioned tubular trunnion bushings 56. The extremity of each of the hinge arms 64 and 66 of each of the gate jaws is formed with a gear toothed sector concentric with the axis of its bearing bore such that opposite adjacent gear sectors of opposite hinge arms intermesh, as best shown at 69 and 70 in FIGURES 4 and 5, for simultaneous opening and closing pivotal movement.

The confrontingly adjacent edges 72 and 73 of opposite gate jaws 6t) and 62 are each preferably formed such that they lie in a plane whereby in closed position, as shown in FIGURE 4, they make sealing, edge to edge abutment with one another. The opposite edges 73' and 75 of the gate jaws 60 and 62 and arms 64 and 66 are spaced from the focal ring 46 by spherical triangular shaped gaps, which permit pivotal movement of the gate jaws between their closed and opened positions shown respectively in FIGURES 4 and 5, such gaps being sealingly closed by means of flexible gap closure means 74 and 76 hereinafter described.

Clearance space is provided between the inner face of each of the hinge arms of the gate jaws and the outer faces of each of the bearing plates 48, into which space extends the circumferentially opposite end portions of flexible, foldable gate jaw gap closure members 74 and 76. The closure members 74 and 76 are clamped adjacent the upper marginal portions thereof in an annular groove 78, formed around the outside surface of the focal ring 46, by means of a circumferentially encircling clamp ring 88. The opposite lower edge portions of each of the flexible closure members 74 and 76 are clamped into inwardly facing grooves formed on the inner, concavely curved surface of each of the jaw members, as best shown at 82 in FIGURES 4, 5, and 6, such clamping being accomplished by means of generally U-shaped rod members, as shown at 84, the ends of which are formed with an approximately l80 bend or loop with the ends thereof extending out to the exterior of the jaws through holes formed in bosses 86 and 88. The outer exposed ends of the rods, which extend out through the bosses 86 and 88, are threaded and provided with nuts, as shown at 90 and 92, by means of which the retainer rods 84 are pressed into grooves against the flexible closure members. The

inner confrontingly adjacent edges of each of the flexible closure members 74 and 76 extend upwardly from each of the attachment points under each of the retainer rod members 84 adjacent the bosses 86 and 88, as indicated by the dotted lines 93 and 94, to the points of attachment, as indicated at 96 and 98 in FIGURE 4, to the focal ring 46, said attachment to the focal ring being in the manner hereinabefore described utilizing the clamp ring 80.

The flexible closure members 74 and 76 are provided adjacent opposite confronting edges thereof with holes through which extend each of the bearing bolts 52 and 54 and trunnion bushings 56 of each of the gate hinge arms 64 and 66, whereby portions of each of the closure members are retained, as before mentioned, in partial sealing engagement between each of the hinge portions of each of the gate hinge arms and the adjacent outer faces of the bearing plates 48, as indicated at 100 and as hereinbefore described in connection with FIGURE 7.

Attached to the lower edge of each of the bearing plates 48 is a downwardly extending, inwardly sloping batfle plate, as best shown at 102 in FIGURES 5 and 7. The lower edges of the baflle plates 102 extend to a point below the lowermost one of the gear teeth of the gear sector portions 69 and 70 of the gate jaw hinge, and in operation serve to prevent the escape laterally of concrete aggregate into and through the gear sectors and bearing portions of the gate jaws. The bearing plates 4-8 and baflle plates 102 together with the portions of the flexible closure members 74 and 76, which extend into the clearance space between such bearing plates and baflle members, and the inner faces of the hinge portions of the gate jaw arms 64 and 66, as shown at ltltl in FIGURE 7, serve likewise to prevent the flow of cementitious materials into the gear sector and bearing portions of the gate hinges. The flexible closure members 74 and 76 being sealed, as hereinbefore described, along the lower edge thereof to the inner surface of each of the gate jaws 60 and 62, respectively, and the upper edges thereof being sealed, as hereinbefore described, to the focal ring 46, the escape of concrete through the clearance spaces of the working mechanism is prevented, while at the same time permitting relatively friction-free hinging motion of the gate jaws between closed and opened positions, as illustrated in FIGURES 4 and 5.

Opening and closing movements of the gate jaws 6t) and 62 is accomplished manually by means of a U-shaped valve actuating lever 106, the inner opposite ends of which are each attached, as shown at 108 and 110, to the outer upper edges of gate hinge arms 64 and 66, such attachment being preferably to the pair of such hinge arms located on the far side of the gate mechanism relative to the operating handle portion of the operating lever 106. A pair of balancing springs, one of which is shown at 112 in FIGURES 2 and 5, extend between a lug 114 attached to the exterior surface of the hopper portion 14, and a similar lug 116 attached to the inner end portion of the lever 1G6 adjacent its point of attachment 108 to the hinge arm portion of the gate jaw 60. The springs 112, acting under tension, serve to overcome the unbalanced rotational moment of the weight of the lever 166 tending to open the gate jaws and further, to bias the gate jaws normally to a firmly closed position relative to one another.

Mounted on and depending from the gate jaws 60 and 62 is shown a downwardly tapered tubular pouring boot 117 which may be used under most conditions, although is not necessarily used under all conditions, in conjunction with the gate mechanism of this invention. When used, attachment is made between the upper open end of the boot member 117 and the gate jaws 60 and 62 by means of a plurality of short, outwardly extending studs, which are welded at their inner ends to the exterior surface of the gate jaws 60 and 62, as best shown at 118 in FIGURES 4 and 5. Grommeted holes are provided in the marginal portion of the upper end of the boot 117, as shown at 120, through which the before mentioned studs 118 extend. Each of the studs is provided adjacent its outer end with a transverse pin hole, through which a suitable pin or cotterkey, as shown at 122, is placed for retention of the boot grommets in supporting engagement with the studs. Sufficient fullness is provided in the upper end of the boot 117 to permit the full opening and closing movements of the gate jaws 60 and 62 between the positions shown in FIGURES 4 and 5.

The boot is preferably made of a relatively thin elastomer or, for example, from sheet material composed of one or more layers of a fabric, such as nylon, Dacron, or the like material bonded together and impregnated with rubber or neoprene or the like natural or synthetic elastomeric material. The flexible closure members 74 and 76 are similarly made of relatively thin sheet material which may be the same or similar to that of which the boot is made, as hereinbefore mentioned.

The rigid portions of the structure of the invention are preferably made of a suitable sheet material, such as sheet steel, the thickness of which may vary for the several parts in accordance with size of the assembly, as well known in the art.

In operation, when the gate jaws 62 and 64 are in closed position, as shown in FIGURE 4, cementitious material or concrete contained in the hopper 14 and the dump gate, is prevented from flowing out of the hopper 14 and gate by means of the closed gate jaws 60 and 62 and the flexible closure members 74 and 76, which seal the space or variable gap between the outer edges of the gate jaw members 60 and 62, hinge arm portions 64 and 66, and the discharge opening through focal ring 46 in the bottom of the hopper 14. Further sealing against leakage of the concrete slurry, while the gate jaws are closed, is prevented by the sealing effect of the portions 100 of the flexible sealing members 74 and 76 which extend into the hereinbefore described clearance space between the inner surfaces of the gate hinge arms 64 and 66 and the adjacent outer faces of the bearing plates 48 surrounding the trunnion bolts 52 and 54 and bushing 56 thereon, as hereinbefore described mainly in connection with FIGURE 7.

Upon opening of the gate jaws 60 and 62, as shown in FIGURE 5, the cementitious material or concrete is released therefrom, as illustrated, in a relatively solid stream, which is prevented by the bearing plates 48 and baflie plates 102 from escaping or squirting laterally out through the sector portions 69 and 70 of the hinge arms 64 and 66, and is restrained to flow downwardly from the lower edge portions of the confronting edges 73 and 75 of the gate jaws through the tubular boot 117 and thence out through the lower end thereof into the form or container into which the cementitious material or concrete is to be deposited.

It is to be understood that the foregoing is illustrative only and that the invention is not limited thereby, but may include various modifications and changes made by those skilled in the art within the scope of the invention, as defined in the appended claims.

What is claimed is:

1. In a concrete pouring bucket having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

an annular member surrounding said opening;

a pair of U-shaped gate jaw members each having a pair of oppositely spaced apart, parallel hinge arm portions;

bearing means adjacent the ends of each of the hinge arms of said jaw members;

bearing means on diametrically opposite sides of said annular member, pivotally cooperating with said bearing means on each of said hinge arms, supporting said gate jaw members astride said annular member for opening and closing pivotal movement relative to one another;

and flexible closure means attached to said gate jaws 5 and to said annular member sealingly closing the variable width gap therebetween while permitting opening and closing pivotal movement of said gate aws.

2. In a concrete pouring bucket having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

a generally U-shaped gate jaw formed with a pair of oppositely spaced apart, parallel hinge arm portions forming the open end thereof;

pivot means adjacent the ends of each of said hinge arms;

pivot means located on substantially diametrically opposite sides of the walls forming said discharge open- 2 ing and cooperating with said first mentioned pivot means for hingingly supporting said gate jaw for swinging motion thereof below and about an axis transverse to the axis of said opening;

and flexible means attached to the walls forming said discharge opening and to said gate jaw, closing the variable gap formed therebetween.

3. In a concrete pouring bucket having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

an annular portion surrounding said opening;

a generally U-shaped gate jaw formed with a pair of oppositely spaced apart, parallel hinge arm portions forming the open end thereof;

pivot means adjacent the ends of each of said hinge arms;

pivot means located on substantially diametrically opposite sides of said annular portion and cooperating with said first mentioned pivot means for hingingly supporting said gate jaw for swinging motion thereof below and about an axis transverse to the axis of said annular opening:

flexible means attached to said annular portion and to said gate jaw, closing the variable gap formed therebetween;

and a flexible tubular member attached to and depending from said gate jaw, the upper end of said tubular member being positioned to receive material discharged from said opening.

4. In a concrete pouring bucket having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

a pair of generally U-shaped gate jaws, each formed with a forward and rearward edge and a pair of oppositely spaced apart, generally parallel hinge arm portions forming the open end thereof;

pivot means carried on substantially diametrically opposite sides of said opening pivotally supporting said gate jaws adjacent the open end portions of said hinge arms, whereby said gate jaws are pivotable toward one another to a closed position below said opening with said forward edges in closed position relative to one another, and pivotable away from one another to an opened position with said forward edges separated;

flexible closure means attached to and extending between said gate jaws and said opening, closing the variable gaps formed between said rearward edges of said gate jaws and said opening;

and means for simultaneously pivoting said gate jaws between said closed and said opened positions.

5. In a concrete pouring bucket having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the how of concrete out through said opening, comprising:

a bearing plate member attached to and extending downwardly from diametrically opposite lower edge c: a pair of spaced apart, parallel trunnion means extending substantially radially outwardly from diametrically opposite sides of said bearing plate members;

portions of said opening; a pair of U-shaped gate jaw members, each including a pair of spaced apart, parallel trunnion means extenda pair of oppositely spaced apart, parallel hinge arm ing substantially radially outwardly from each diportions forming the open ends thereof; ametrically opposite side of said bearing plate mempivot means included in and positioned adjacent each bers; end of said hinge arm portions, the pivot means of a pair of U-shaped gate jaw members, each including a the opposite hinge arms of one of said gate jaw pair of oppositely spaced apart, parallel hinge arm members being pivotally carried on diametrically portions forming open ends thereof; opposite ones of said trunnion means, and the pivot pivot means included in and positioned adjacent each means of the opposite hinge arms of the other of end of said hinge arm portions, the pivot means of said gate jaw members being pivotally carried on the opposite hinge arms of one said gate jaw member the other diametrically opposite ones of said trunbeing pivotally carried on diametrically opposite ones nion means; of said trunnion means, and the pivot means of the intermeshing gear teeth on opposite adjacent pairs of opposite hinge arms of the other said gate jaw' memsaid hinge arms, coaxial with the corresponding her being pivotally carried on the other diametricalpivot means, whereby said gate jaws are simultaly opposite ones of said trunnion means; neously pivotal toward and away from one another intermeshing gear teeth on opposite adjacent pairs of between opened and closed positions;

said hinge arms, coaxial with the corresponding pivot flexible closure means attached to the inner surface means, whereby said gate jaws are simultaneously of each of said gate jaws and to the outer periphery pivotable toward and away from one another between of said ring member and extending between said opened and closed positions; 25. hinge arm portions and said bearing plate memflexible closure means attached to each of said gate bers, and positioned sealingly to close the variable jaws and to the periphery of said opening and extendgaps formed between said hinge arm portions, said ing between said hinge arm portions and said bearing gate jaws and said ring member; plate members, and positioned to close the variable and means for imparting pivotal motion to said gate gaps formed between said hinge arm portions, said jawsv gate jaws and said opening;

and means for imparting pivotal opening and closing motion to said gate jaws.

6. In a concrete pouring bucket, having a downwardly 8. In a concrete pouring bucket, having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

a ring member surrounding said opening; a bearing plate member attached to and extending downwardly from diametrically opposite lower edge directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

a ring member surrounding said opening; two pairs of spaced apart, parallel trunnlon means,

portions of said ring member; two pairs of spaced apart, parallel trunnion means,

one of each of said pairs extending substantially one each of such pairs extending substantially radially outwardly from diametrically opposite sides radially outwardly from diamfitricahy pp sides of said ring member; of Said bearing plate members;

a i f uh d gate j b h i l di a pair of U-shaped gate jaw members, each including a pair of oppositely spaced apart, parallel hinge a pair of oppositely spaced apart, parallel hinge arm arm portions forming the open ends thereof; P fhrmihg h p ends thereof;

pivot means included in and positioned adjacent each PIVOt mean$ 1nhlded In and Positioned adjacent each end of said hinge arm portions, the pivot means of end of salfl hlhge arm Porhohs, the P P means of the opposite hinge arms of one of said gate jaw the e ge arms of P of gate j members being pivotally carried on diametrically memhers helhg p f y earned on diametrically opposite ones of said trunnion means, and the pivot 5 pp 01165 of Sa1d lifuhnion means, and the Pivot means of the opposite hinge arms of the other of of f pp hlnge t s 0f the ther of said gate jaw members being pivotally carried on Sald gate J mefhhers hem}; P Y Carried 011 the other diametrically opposite ones of said trunh other dlametrlcally pp ones f d trunnio means; 111011 lntians;

intermeshing gear teeth on opposite adjacent pairs of gear Sect0f$ having intermeshihg gear teeth ri d said hinge arms, coaxial with the corresponding pivot PPP adjacent P i of Said hihgfi arms, means, whereby said gate jaws are simultaneously aXlal With h correshohdlng h Of Said P means, pivotal toward and away from one another between whereby Sald gaie J are slmultaheohsly Pivotal opened and Closed positions; toward and away from one another between opened flexible closure means attached to each of said gate 60 h closed Poslhohs;

jaws and to the periphery f Said ring member and flexible closure means attached to the inner surface of extending between said hinge arm portions and R Sald 8 l and to Outer P P Y of around said trunnion means, and positioned to close Sald nng member d fiXtehfiihg hetwehh Said hinge the variable gaps formed between said hinge arm Portions and Sald heanhg Plate members, and portions, Said gate jaws and said ring member; positioned to extend across and close the variable and means for imparting pivotal motion to said gate jaws. 7. In a concrete pouring bucket, having a downwardly gaps formed between the rearward sides of said hinge arm portions, said gate jaws and said ring member;

and means for imparting pivotal motion to said gate aws.

directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising: a ring member surrounding said opening; a bearing plate member attached to and extending downwardly from diametrically opposite lower edge portions of said ring member;

9. In a concrete pouring bucket, having a downwardly directed discharge opening in the bottom thereof, the improvement in gate means for controlling the flow of concrete out through said opening, comprising:

a ring member surrounding said opening;

a hearing plate member attached to and extending 9 10 downwardly from diametrically opposite lower edge toward and away from one another between opened portions of said ring member; and closed positions; two pairs of spaced apart, parallel trunnion means, flexible closure means attached to the inner surface of one each of such pairs extending substantially each of said gate jaws and to the outer periphery of radially outwardly from diametrically opposite sides said ring member and extending between said hinge of said bearing plate members; arm portions and said bearing plate members, and a pair of U-shaped gate jaw members, each including positioned to extend across and close the variable a pair of oppositely spaced apart, parallel hinge arm gaps formed between the rearward sides of said portions forming the open ends thereof; hinge arm portions, said gate jaws and said ring pivot means included in and positioned adjacent each member;

end of said hinge arm portions, the pivot means a tubular 1309i member dependmg f said gate l f the opposite hinge arms of one of said gate jaw members, including means encircllngly attaching the upper open end of said boot member to the exterior of said gate jaw members and in communication with the opening therebetween;

and means for imparting pivotal motion to said gate aws.

members being pivotally carried on diametrically opposite ones of said trunnion means, and the pivot means of the opposite hinge arms of the other of said gate jaw members being pivotally carried on the other diametrically opposite ones of said trun- 11 i t l l t h t th d References Cited in the file of this patent gear sec ors avmg 1H ermes mg gear ee came on opposite adjacent pairs of said hinge arms, coaxial UNITED STATES PATENTS with the corresponding one of said pivot means, 116087962 Sewn. 1926 whereby said gate jaws are simultaneously pivotal 2,901,148 Cunnmgham et 25, 1959 UNITED STATES PATENT OFF-ICE CERTIFICATE OF CORRECTION Patent No, 3,146324 September 1 1964 Raymond B Cozadd et al.,

It is hereby certified, that error appears in the above numbered patexit requiring correction and that the said Letters Patent should read as corrected below Column 5 line 75, for "on" read of Signed and sealed this 29th day of December 1964,

(SEAL) Altest:

ERNEST W. SWIDER' EDWARD J. BRENNER Attesting Officer Commissioner of Patents 

1. IN A CONCRETE POURING BUCKET HAVING A DOWNWARDLY DIRECTED DISCHARGE OPENING IN THE BOTTOM THEREOF, THE IMPROVEMENT IN GATE MEANS FOR CONTROLLING THE FLOW OF CONCRETE OUT THROUGH SAID OPENING, COMPRISING: AN ANNULAR MEMBER SURROUNDING SAID OPENING; A PAIR OF U-SHAPED GATE JAW MEMBERS EACH HAVING A PAIR OF OPPOSITELY SPACED APART, PARALLEL HINGE ARM PORTIONS; BEARING MEANS ADJACENT THE ENDS OF EACH OF THE HINGE ARMS OF SAID JAW MEMBERS; BEARING MEANS ON DIAMETRICALLY OPPOSITE SIDES OF SAID ANNULAR MEMBER, PIVOTALLY COOPERATING WITH SAID BEARING MEANS ON EACH OF SAID HINGE ARMS, SUPPORTING SAID GATE JAW MEMBERS ASTRIDE SAID ANNULAR MEMBER FOR OPENING AND CLOSING PIVOTAL MOVEMENT RELATIVE TO ONE ANOTHER; AND FLEXIBLE CLOSURE MEANS ATTACHED TO SAID GATE JAWS AND TO SAID ANNULAR MEMBER SEALINGLY CLOSING THE VARIABLE WIDTH GAP THEREBETWEEN WHILE PERMITTING OPENING AND CLOSING PIVOTAL MOVEMENT OF SAID GATE JAWS. 